1,721,072 research outputs found
Signal Spectrum Analysis and Period Estimation by Using Delayed Signal Sampling
No full textThe paper describes a signal power spectrum analyzer and a signal period estimator whose bandwidth is not limited by the mean sampling time. The procedure relies on the evaluation of the input signal autocorrelation function in different delayed
time instants, located at either equispaced or random time instants.
To do this, a recursive random sampling process in the time domain was used in order to avoid any bandwidth limitation due
to the sampling strategy in the evaluation of each autocorrelation function. The signal power spectrum as well as its period, provided that an approximate value of the fundamental frequency is known, can finally be evaluated. Some theoretical background and experimental work are reported in the paper for validating the performance of the method
A numerical approach to the evaluation of uncertainty in nonconventional measurements on power systems
No full textThe application of the rules endorsed by the ISO Guide to the expression of uncertainty in measurement (GUM) can turn into a difficult task when quantities that characterize the operation of modern power systems are measured by means of DSP-based instruments.
A numerical approach to easily tackle this task is proposed in this paper, as an alternative to the uncertainty evaluation based on the analytical solution of the uncertainty propagation law, as prescribed by the GUM.
The validity of the numerical approach, which is based on a Monte-Carlo procedure, is first proved in the case of the spectral analysis of a periodic signal, which is the first step for many non-conventional measurements. Then the evaluation of the accuracy of a method for the measurement of the harmonic losses in a power transformer supplying nonsinusoidal load currents is dealt with as an application exampl
An Automatic Test Equipment for the Calibration of Voltage Transducers
No full textThis paper describes the theory of operation and the design of an automatic test equipment (ATE) for the calibration of voltage transducers in a wide range of frequency. It also discusses the performance of a lab prototype and shows the results of some calibration tests performed by using the ATE proposed
A Smart Frequency Domain-Based Modeling Procedure of Rogowski Coil for Power Systems Applications
Full text linkRogowski coils are key measurement instruments in several applications due to their flexibility, large bandwidth, linearity, and so on. Like the majority of the instrument transformers (ITs), Rogowski coils are standardized and their use is regulated almost for every application. This article focuses on a smart way for the equivalent parameters' computation of the Rogowski coil. The parameter computation is performed by evaluating the Rogowski response when subjected to a single waveform generated to fulfill a specific requirement on its frequency content. Results demonstrate the equivalency of the presented method compared to the typical frequency sweep test. In addition, the results have been used to validate Rogowski's output estimate procedure presented by the authors in a previous work
PMU-Based Estimation of Inertia Variation: Proposed Metric and Feasibility Analysis
No full textDue to the ever-increasing penetration of renewable energy sources, the estimation of network inertia is becoming a critical task for system operators. This operation is typically carried out by aggregating synchronized measurements acquired at different nodes. In this paper, instead, we investigate the feasibility of a local approach for inertia estimation. In this sense, PMU-based measurements of ROCOF and phasors are exploited to define a new indicator of inertia variations. A preliminary validation in realistic simulated scenarios confirms the proposed approach's potential
Schede
No full textContributo ospitato all'interno del volume "Alle origini della Romagna. 2. I primi abitanti", catalogo della omonima mostra tenutasi a Forlì dal 27 settembre al 22 novembre 198
L'insediamento di Monte Poggiolo nel quadro del Paleolitico inferiore italiano
No full textContributo ospitato all'interno del volume "Alle origini della Romagna. 2. I primi abitanti", catalogo della omonima mostra tenutasi a Forlì dal 27 settembre al 22 novembre 198
L'industria litica
No full textContributo ospitato all'interno del volume "Alle origini della Romagna. 2. I primi abitanti", catalogo della omonima mostra tenutasi a Forlì dal 27 settembre al 22 novembre 198
I paleosuoli con industria litica di tecnica Levallois del Paleolitico inferiore: i reperti litici
No full textContributo ospitato all'interno del volume "Alle origini della Romagna. 2. I primi abitanti", catalogo della omonima mostra tenutasi a Forlì dal 27 settembre al 22 novembre 198
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